Barnaby Joyce and Vikki Campion seal interview deal with Seven

Former Deputy Prime Minister Barnaby Joyce and his partner Vikki Campion are set to give an exclusive interview to Seven's Sunday Night program after inking a deal with the broadcaster worth a reported $150,000.

Mr Joyce and Ms Campion, his former media adviser, have been at the centre of a publicity storm since news of their relationship broke on February 7. Their son Sebastian was born at Armidale Hospital on April 16.

Barnaby Joyce and his former media advisor Vikki Campion, mother of his new baby boy, Sebastian.Credit:Fairfax Media

At the time, Mr Joyce was still clinging to the deputy prime ministership and the Nationals leadership, but he resigned from both posts two days later. The backbench move saw his salary drop from $416,000 to about $200,000 a year.

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Seven paid $150,000 to secure the interview rights with the couple for its Sunday Night program following a bidding war with Nine's 60 Minutes, News Corp reported.

In a statement released after The Daily Telegraph published photos of the pregnant Ms Campion on its front page in February, Mr Joyce's wife Natalie said she was “deeply saddened by the news that my husband has been having an affair and is now having a child with a former staff member”.

The couple have four daughters together, and Mr Joyce confirmed they were separated after the New England byelection in December.

The relationship scandal was further compounded by questions relating to Mr Joyce's use of travel entitlements, his rent-free living arrangements during the byelection, harassment allegations by a woman in Western Australia, and the appropriateness of a decision to move Ms Campion to the offices of senator Matt Canavan and MP Damian Drum.

It was argued by Prime Minister Malcolm Turnbull on February 12 that Mr Joyce was not in breach of the ministerial code in having Ms Campion employed by fellow MPs because she was not technically his "partner" at the time.

But in an extraordinary press conference just three days later, the Prime Minister lambasted his deputy's "shocking error of judgment" before introducing a ban on ministers having sexual relations with their staff.